Fastener



FIG. 1 is an isometric view of a top, front, and right side of an ornamental design for a fastener;

FIG. 2 is an isometric view of a bottom, front, and right side of the fastener of FIG. 1;

FIG. 3 is a front elevational view of the fastener of FIG. 1;

FIG. 4 is a rear elevational view of the fastener of FIG. 1;

FIG. 5 is a right side elevational view of the fastener of FIG. 1;

FIG. 6 is a left side elevational view of the fastener of FIG. 1;

FIG. 7 is a top plan view of the fastener of FIG. 1; and,

FIG. 8 is a bottom plan view of the fastener of FIG. 1.

The dash-dash-dash-dash lines are included for the purpose of illustrating portions of the fastener that form no part of the claimed design. The dash-dot-dash lines depict boundary lines and form no part of the claimed design. 

CLAIM The ornamental design for a fastener, as shown and described. 